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Samsung TV error 118 appears when the TV cannot detect a valid signal from an antenna, cable box, or connected source device, leaving the screen blank or displaying a "no signal" message.
What Causes Error 118
A disconnected or loose antenna or coaxial cable is the most common and simplest cause, easily overlooked after cleaning or rearranging furniture. Weak broadcast signal strength, particularly in areas with poor terrestrial coverage or during heavy rain, can also trigger this error for antenna-based setups. An incorrect input source selection, where the TV is set to the wrong HDMI or AV input, produces a similar no-signal message. Faulty cable box or set-top box output, whether from the source device itself or its connecting cable, is another frequent cause worth ruling out.
How to Fix Error 118
First, confirm the TV is set to the correct input source matching your antenna, cable box, or device connection. Check that all antenna or coaxial cables are firmly connected at both the TV and wall socket ends. For antenna users, running an automatic channel scan through Settings > Broadcasting > Auto Program can refresh signal detection. If using a set-top box, restart the box itself, as Samsung TV error 118 is sometimes caused by the source device rather than the TV. Testing with a different cable or source device helps isolate whether the fault lies with the TV's tuner or the external equipment.
Cost Guide (Nairobi)
| Service | Estimated Cost (KES) |
| Diagnostic check | 500 - 1,000 |
| Cable/connector replacement | 300 - 800 |
| Channel scan and retuning | Free - 500 |
| Tuner module repair | 2,500 - 5,500 |
Frequently Asked Questions
- Why does my TV say no signal even though the cable box is on? This often indicates a loose connection or the TV being set to the wrong input source.
- Can weather affect antenna signal strength? Yes, heavy rain and storms can weaken over-the-air broadcast signals, temporarily triggering this error.
- Should I rescan channels regularly? Rescanning periodically, especially after signal issues, helps ensure the TV has the most accurate channel list.
- Is this error more common with older antennas? Yes, ageing antenna equipment and cabling are more prone to signal degradation over time.
- How do I know if the fault is my TV or my set-top box? Testing the set-top box on another TV, or a different source on your TV, quickly isolates which device is at fault.